Kevin McHale would dominate in today's game, plain and simple.
He'd probably foul DH out in 3 quarters, or certainly limit his effectiveness if he didn't foul him out.
Defensively? He'd limit the vast majority of bigs he went up against, even Dwight. He wouldn't be as strong as Dwight, but those long arms of his would certainly give Howard problems.
Just my guess stats-wise?
20-24 pts, about 8 rebs if playing PF, 10-11 if playing C, 2-3 blocks if not more, 1-2 stls.
My biggest question is his assists...how many would he avg in today's game vice the 80's, because I don't think he ever averaged more than 2 assists.